Here’s what to expect when you are 16 weeks pregnant with twins:
Fetal Development
By 16 weeks in the twin pregnancy each of your twins is about 6.5 inches (165 mm) long and weigh 3.5 onces (99 grams). Each baby averages the following measurements:
Head circumference: 5″ (126mm) which is about the same as a golf ball
Abdominal Circumference: 4.5″ (115mm) which could fit inside a toilet paper roll
Femur Bone Length (from the waist to knee): 0.8″ (22mm) which is about the same as the width of a US penny
Each baby is about the size of an avocado.
Your twins’ eyes have moved from the side of their heads to the front. They are very active and moving around but it is still too early for Mom to feel them yet.
Learn more about your twins’ development here: Twins fetal development- 16 weeks pregnant.
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What to Expect
Typical weight gain for Mom at this point is between 1 to 1.5 pounds/week (0.5 to 0.7kg).
Total weight gain for the twin pregnancy so far will average between 16 to 24 pounds (7.3 to 10.9kg).
Mom will likely start to feel pain in her sides by this stage of the twin pregnancy as her body starts to stretch to accommodate the babies.
(RELATED: Your twins will need a lot of gear. Here's the complete twins baby registry checklist to get ready for your twins' arrival.
Pictures and Video
Here’s an ultrasound video of what you might see at 16 weeks pregnant with twins:
Belly picture at 16 weeks:
What to Prepare This Week
When Mom is 16 weeks pregnant with twins, you should have started talking about where your twins will sleep when they get home. Discuss if you want your twins to sleep in your room or not.
From Your Fellow Twin Parents
Jesse S. – “16 weeks….starting to look at minivans!”
Scott B. – “Mom is super nauseous and doesn’t feel well most of the day.”
Solace M. – “I am great and my bump is showing now.”
Dad’s Thoughts
By the time Mom reaches 16 weeks pregnant with twins, you may feel emotionally overwhelmed. Lots of things about the twin pregnancy are out of your control. Feeling worried about this is natural. Try to funnel your emotions into activities and preparations that you can control.
Get Weekly Twin Pregnancy Updates
(NOTE: Still expecting? 
Get weekly updates on your twin pregnancy here.)
Still wondering how to prepare for your twins? I cover specific things you should know and prepare for in my Dad’s Guide to Twins book. Learn more about the book here.
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Sources: When You’re Expecting Twins, Triplets, or Quads: Proven Guidelines for a Healthy Multiple Pregnancy by Dr. Barbara Luke and Tamara Eberlein and Babycenter’s Average fetal length and weight chart
